Work-clamping dog.



No. 764,523. PATENTED JULY 5, 1904, F. L. CURTIS. WORK OLAMPING DOG.

APPLIOATIOR' I-ILBD FEB. 12. 1904.

N0 MODEL.

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UNTTED STATES Patented Jul 5, 1904.

FREEMAN L. CURTIS, OF BARBERTON, OHIO.

. WORK-OLAMPINVG DOG.

SPECIFICATION forming part of Letters Patent No. 764,523, dated July 5, 1904,,

Application filed February 12, 1904, Serial No 193,327. (No model.)

To all, wi /unlit IIMLZ/ concern:

Be it known that I, FREEMAN L. (JUR'rIs, a citizen of the United States, residing at Barberton, in the county of Summit and State of Ohio, have inventeda new and useful VVork- Clamping Dog, of which the following is a specification.

This invention relates to improvements in work-clamping dogs, and has for its principal object to provide a device for holding pieces of wood while they are being turned, especially where two or more pieces of wood are assembled in a practically solid body to form a sectional pattern.

A further object of the invention is to provide a dog whereby a plurality of pieces of wood may be held together without the employment of dowels, glue, or other securing devices and in which there will be no danger of splitting the wood or of the separation of the pieces during the application of the dogs or the turning operation.

A still further object of the invention is to provide a device of this character in which the pieces of wood when so assembled may be then supported by the ordinary lathe centers, stocks, or other supports without the necessity of change of the parts or the employment of auxiliary mandrels or other securing devices.

With these and other objects in view, as will more fully hereinafter appear, .the invention consists in the novel construction and arrangement of parts hereinafter described, illustrated in the accompanying drawings, and par ticularly pointed out in the appended claim,

it being understood that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure 1 is a longitudinally-sectional elevation illustrating a pair of dogs supporting and holding together two pieces of wood to be turned in cylindrical form. Fig. 2is a-transverse sectional elevation of the same. Fig. 3 is an enlarged detail sectional view of the ring dog detached.

i Fig. 4 is a view similar to Fig. 2, showing a number of pieces of wood held together by a dog.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

in pattern-makingand other work it is often desirable to forma sectional cylindrical body from wood,and this is sometimes accomplished by uniting pieces by glue, dowel-pins, or other fastening devices and separating the same after the turning operation has been completed. This is objectionable, inasmuch as the holding device employed cannotalways be relied upon to properly support the work, and if the securing devices are of such a positive nature as to hold thework it becomes diflicult to afterward separate the sections.

In carrying out the present invention a ring dog 1 is used. This dog is in the form of a ring having a flange 2, that tapers to a sharp edge 3. The outer wall of this flange is of uniform diameter from edge to edge; but the inner wall thereof, as indicated at i, is tapering, being gradually reduced in diameter from the thin entering edge to the opposite edge. The driving portion of the ring is formed of athickened flange 5, and this may be driven by a hammer or other suitable tool in order to force the thin edge of the ring into the wood. 7

in carrying out the invention two or more pieces are assembled together and clamped in a vise, after which the thin edge of the ring is placed in position against the end of the wood and the ring is driven home by one or more hammer-blows. Owing to the gradually-decreasing diameter of the inner wall of the flange, the sections of wood will be drawn toward the center of the ring and will be firmly clamped and held to each other, while the straight wall, which forms the outer portion of the flange, will enter the grain of the wood without tending to split the same, and in practice it is found that the driving in of the ring dog will tend to hold the sections of wood together even more tightly than when clamped in a vise.

After the rings have been driven into the opposite ends of the wood the wood and rings are placed in an ordinary lathe and centered, the head and tail stocks engaging the ends of the wooden sections, or any ordinary wood-engaging devices may be employed, as the rings will not interfere with their use.

After the turning operation is completed the ring may be knocked off by a hammerblow, and the sections will separate from each other and may be used for molding or for any other purpose for which they are intended.

It will be seen that the work-holding dogs are entirely independent of the lathe or other machine on which the work may be subsequently placed, and owing to the fact that the rings are comparatively inexpensive they may be employed in large numbers for preparing the work before the latter is placed in the lathe, the usual head and tail stocks of the lathe passing through the rings and engaging the work in the ordinary manner.

Having thus described the invention, what is claimed is A ring dog for clamping together pieces of wood to be subsequently turned in a lathe, said ring being wholly independent of the lathe- FREEMAN L. CURTIS.

Witnesses:

J. H. JooHUM, Jr., FRANK S. APPLEMAN. 

